CN112097096A

CN112097096A - Full-capacity LNG storage tank lining structure and deformation-preventing construction method thereof

Info

Publication number: CN112097096A
Application number: CN202011061577.5A
Authority: CN
Inventors: 张志琪; 李保清; 张胜男; 刘守焱; 于继明; 翁大龙; 孙建军; 邢金中; 陈成建
Original assignee: Sinopec Tenth Construction Co Ltd
Current assignee: Sinopec Tenth Construction Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-18

Abstract

The invention provides a liner structure of a full-capacity LNG storage tank and an anti-deformation construction method, belonging to the technical field of the full-capacity LNG storage tank. During construction, the construction is carried out in sequence according to the serial number sequence. In each area, the bottom plate is firstly welded and detected, and then the concrete is poured into the leveling layer for the first time. The invention mainly solves the problems of reworking and reduction of the construction quality of the storage tank bottom plate caused by overproof concave-convex deformation generated after the integral welding of the lining bottom plate is finished. The invention can reduce the deformation area and the deformation of the bottom plate and reduce the construction difficulty, thereby avoiding the rework caused by the overproof deformation, saving the investment of manpower and machine materials and greatly improving the engineering quality and the safety performance of the storage tank; and due to the fact that installation and civil engineering professional cross construction are conducted, the construction period of the storage tank is shortened.

Description

Full-capacity LNG storage tank lining structure and deformation-preventing construction method thereof

Technical Field

The invention relates to the technical field of full-capacity LNG storage tanks, in particular to a full-capacity LNG storage tank lining structure and a deformation prevention construction method thereof.

Background

With the introduction of a series of measures for accelerating the application of clean energy such as 'changing coal into gas' and the like, LNG as high-efficiency clean high-quality energy has gradually changed the effect exerted in winter from peak shaving to the main power of gas supply in China, has become an important source of natural gas supply, and has increasingly prominent importance in natural gas supply systems in China. Furthermore, import of overseas natural gas is one of the important ways of natural gas supply. China imports LNG resources mainly depend on coastal LNG receiving stations. The LNG receiving station unloads LNG purchased overseas from China to a wharf, and outputs natural gas to a terminal user after the LNG is gasified.

The LNG tank is a core device of the receiving station as a low-temperature normal-pressure vessel for storing LNG. At present, the LNG receiving station is divided into a single-capacity tank, a double-capacity tank, a full-capacity tank and a film tank according to the inclusion of gas and liquid, wherein the full-capacity tank is the main tank type of the LNG receiving station in the current stage of China. The storage tank consists of a prestressed concrete outer tank, a lining, a secondary bottom plate, a hot angle protection system, a 9% Ni steel inner tank and various cold insulation materials, and has the characteristics of more cross specialties, close cross professional relationship, high construction quality requirement and the like.

The liner is also called a lining plate, a damp-proof plate and a steam barrier, is a metal plate which is tightly attached to the inner side of the concrete outer tank, has the function of preventing BOG and water vapor from permeating, and is of great importance to the safety of the storage tank. The lining is composed of a bottom plate and wall plates. The method of professional independent construction, integral welding and integral pouring is adopted for the bottom plate and the concrete primary leveling layer at the present stage, namely: firstly, welding all the laid edge plates, the middle breadth plates and the special-shaped plates, and pouring a concrete primary leveling layer. The welding method has the defects that in the welding process of the welding seam of the base plate, the steel plate generates welding deformation due to uneven heating, and the macro expression is that the base plate can generate concave-convex deformation. The control of the concave-convex deformation during the welding of the bottom plate is generally realized by controlling the welding sequence, and the commonly adopted method is as follows: and welding from the center to the edge of the bottom plate, welding a short welding seam firstly, then welding a long welding seam, and adopting a sectional back welding and skip welding mode for the long welding seam. Although the concave-convex deformation can be reduced to a certain extent by adopting the method, the area of the bottom plate is large, the number of welding seams is large, and the whole welding process still has large deformation area and deformation, so that the 'slotting' rework is easily caused, the labor and the materials are wasted, the construction period is prolonged, and even the nest work is caused.

Disclosure of Invention

The invention aims to provide a full-capacity LNG storage tank lining structure which reduces the concave-convex deformation area and the concave-convex deformation amount of a bottom plate, avoids the deformation exceeding standard and improves the construction efficiency and the engineering quality so as to solve at least one technical problem in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the present invention provides a liner structure for a full-capacity LNG storage tank, comprising:

a floor, wall panels and corner panels;

the bottom plate, the wall plate and the corner plate are connected and then are arranged on a concrete substrate together, and a leveling layer is arranged on the upper surface of the bottom plate;

the bottom plate is connected with the wall plate through the corner plate, the vertical side of the corner plate is connected with the wall plate, and the horizontal side of the corner plate is connected with the bottom plate;

the bottom plate comprises an annular edge plate, and a plurality of transverse breadth plates are arranged on the inner ring of the annular edge plate along the direction of the construction door opening; the space between two adjacent transverse amplitude plates is equal, a plurality of longitudinal amplitude plates are connected between the two adjacent transverse amplitude plates and between the transverse amplitude plates at two ends and the annular edge plate, and the adjacent longitudinal amplitude plates are mutually connected; and a plurality of special-shaped plates are connected between the longitudinal web plate on the outermost side and the annular edge plate, and two adjacent special-shaped plates are connected with each other.

Preferably, the annular edge plate comprises an outer ring edge plate and an inner ring edge plate;

the outer ring edge plate is formed by connecting a plurality of outer ring arc-shaped plate monomers;

the inner ring edge plate is formed by mutually connecting a plurality of inner ring arc-shaped plate monomers;

the transverse web is formed by a plurality of transverse web elements interconnected to one another.

Preferably, two ends of the plurality of outer ring arc-shaped plate monomers are sequentially butted to form the outer ring edge plate, and two ends of the plurality of inner ring arc-shaped plate monomers are sequentially lapped to form the inner ring edge plate.

Preferably, adjacent transverse web plates are sequentially connected in an overlapping mode, adjacent longitudinal web plates are connected in an overlapping mode, and the transverse web plates are connected with the longitudinal web plates in an overlapping mode.

Preferably, the corner plate is connected with the annular edge plate to form an edge plate area; a plurality of transverse web plates are connected to form a through long plate area, and a plurality of longitudinal web plates are connected to form a fish scale area; the lap weld between the transverse web and the longitudinal web is a through-length seam; the lap weld between the special-shaped plate and the edge plate of the inner ring is a tortoise-shell seam.

Preferably, the transverse web, the longitudinal web, the profiled sheet, the annular edge panel and the corner panel are all made of 16MnDR material.

In another aspect, the present invention also provides a deformation prevention construction method for an LNG storage tank lining structure as described above, which is constructed in a direction from a secondary construction door opening to a primary construction door opening, comprising the steps of:

step S110: laying the bottom plate according to the following sequence: the edge plate of the outer ring, the edge plate of the inner ring, a transverse amplitude plate, a longitudinal amplitude plate (8) and a special-shaped plate (9);

step S120: welding the bottom plate according to the following sequence: the weld joints of the edge plate area, the weld joints of the fish scale area, the weld joints of the full-length plate area, the full-length seam and the tortoise-shell seam;

step S130: after the welding seams of the edge plate area are welded and accepted, dividing the area formed by combining the corner plate and the annular edge plate into a plurality of subareas, and respectively pouring a leveling layer for each subarea;

step S140: dividing the fish scale area into a plurality of cells, assembling and welding longitudinal webs in each cell in a two-in-one mode, a four-in-one mode and an eight-in-one mode, arranging temporary balance weights on two sides of a welding seam during welding, and pouring a concrete first leveling layer in each cell after the welding seam is welded and accepted;

step S150: repeating the step S140 until the pouring of the leveling layers of all the cells in the fish scale area is completed;

step S160: dividing a joint area consisting of the full-length slab area and the adjacent tortoise-shell seam area into a plurality of cells, and welding short seams, full-length seams and tortoise-shell seams of the full-length slab area in each cell; after welding seams are completely welded and accepted, pouring a leveling layer in the cell;

step S170: repeating the step S160 until the pouring of the leveling layers of all the cells of the combined area consisting of the full length slab area and the tortoise-shell seam area is completed;

step S180: and finishing the pouring of the concrete primary leveling layer in the ramp area of the large gate opening.

Preferably, the concrete primary leveling layer in the edge plate area, the fish scale area, the full-length plate area and the tortoise-shell seam area is completely poured to form a continuous whole, and then the construction is finished.

Preferably, during the welding of the through long seam and the tortoise shell seam, the bottom plate is pressed down and tightly attached to the tank bottom by means of the weight of the concrete leveling layer poured in the adjacent area, so that the bottom plate has a counterweight effect on one side or two sides of the welding line to be welded on the periphery.

Preferably, the levelness of the leveling layer needs to meet the following requirements: the height difference between any two points in the range of 200mm inward and outward of the butt joint edge plate in the whole circumferential length range is not more than 12mm, and the height difference between any two points in the range of 10m is not more than 6 mm.

The invention has the beneficial effects that: the structure construction degree of difficulty is little, can also reduce bottom plate deformation area, deflection, has improved LNG storage tank security performance, has stopped the rework that causes because of the deflection exceeds standard, has practiced thrift the input of manual work and machines material, has improved the engineering quality, has shortened the time limit for a project, has improved the efficiency of construction, has reduced construction cost.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a top view of an installation structure of a liner structure of a full-capacity LNG storage tank according to an embodiment of the present invention.

Fig. 2 is a sectional structural view of a corner plate and a bottom plate and a wall plate of a liner structure of a full-capacity LNG storage tank according to an embodiment of the present invention.

Fig. 3 is a schematic view of deformation-preventing partition construction of the liner structure of the full-capacity LNG storage tank according to the embodiment of the present invention.

Wherein: 1-a concrete base; 2-wall plate; 3-corner plates; 4-leveling layer; 5-vertical side; 6-horizontal side; 7-transverse web monomer; 8-longitudinal web; 9-a shaped plate; 10-outer ring arc plate monomer; 11-inner ring arc plate monomer; 12-suture tortoise shell; 13-through long seam.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present specification, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present specification, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present technology.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and "disposed" are intended to be inclusive and mean, for example, that they may be fixedly coupled or disposed, or that they may be removably coupled or disposed, or that they may be integrally coupled or disposed. The specific meaning of the above terms in the present technology can be understood by those of ordinary skill in the art as appropriate.

For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.

It should be understood by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements shown in the drawings are not necessarily required to practice the invention.

Example 1

This embodiment 1 provides a general construction method of leveling layer once of full-capacity formula LNG storage tank lining bottom plate and concrete, solves the unsmooth deformation that exceeds standard that produces after the whole welding of lining bottom plate is accomplished and causes doing over again and reduce the problem of storage tank bottom plate construction quality. The method of the embodiment can reduce the deformation area and the deformation of the bottom plate and can also reduce the construction difficulty, thereby avoiding the rework caused by the exceeding of the deformation, saving the investment of manpower and machine materials, and greatly improving the engineering quality and the safety performance of the storage tank; and due to the fact that installation and civil engineering professional cross construction are conducted, the construction period of the storage tank is shortened.

In this embodiment 1, general structure technical scheme is as follows to formula LNG storage tank lining structure and concrete once-through screed-coat of holding entirely:

the full-capacity LNG storage tank lining is composed of a bottom plate, wall plates 2 and corner plates 3, wherein the corner plates 3 are connected with the bottom plate and the wall plates 2. Wherein, the bottom plate, the wall plate 2 and the corner plate 3 are connected and then are arranged on the concrete base 1 together. The vertical side 5 of the corner plate 3 is connected with the wall plate 2, and the horizontal side 6 of the corner plate 3 is connected with the outer ring edge plate of the bottom plate.

The bottom plate comprises an edge plate (namely an annular edge plate, comprising an outer ring edge plate and an inner ring edge plate), a middle web (comprising a transverse web and a longitudinal web) and a special-shaped plate 9, wherein the edge plate is an annular steel plate, the middle web is a rectangular steel plate, and the special-shaped plate 9 is an irregular steel plate.

For example, the special-shaped plate 9 can be a right triangle, and the hypotenuse of the right triangle is an arc matched with the single inner ring edge plate; the profiled sheet 9 may also comprise a rectangular strip, the edge of which connected to the inner ring edge panel is arc-shaped corresponding to the radian of the inner ring edge panel. The purpose of the shaped plate 9 is to fill the space enclosed by the transverse web, the longitudinal web and the inner ring edge plate.

The edge plate comprises 2 circles, the outer circle edge plate is in butt joint connection with a plurality of outer circle edge plate monomers 10, the inner circle edge plate is in lap joint with a plurality of inner circle edge plate monomers 11, and the outer circle edge plate and the inner circle edge plate are in lap joint.

The middle web is formed by combining and connecting two arrangement modes of a transverse arrangement mode and a longitudinal arrangement mode, the transverse web is overlapped by the short edge end of a transverse web monomer 7 (a rectangular steel plate), the long edge end of the rectangular steel plate is overlapped between the longitudinal web and the longitudinal web, and the transverse web is connected with the longitudinal web in an overlapping mode.

The special-shaped plate 9 is in lap joint, the special-shaped plate 9 is in lap joint with the edge plate of the inner ring, and the special-shaped plate 9 is in lap joint with the middle breadth plate.

And after the outer ring edge plate is welded, assembling and welding the corner plate, and completing the lap welding between the corner plate and the outer ring edge plate.

The area formed by connecting the corner plate and the edge plate is called the edge plate area.

The area formed after the transverse middle webs are connected is called a full-length plate area, and the area formed after the longitudinal middle webs are connected is called a fish scale area.

The lap weld between the transverse middle web and the longitudinal middle web is called a through-length seam 13.

The lap weld between the profiled sheeting and the inner ring edge panel is referred to as the tortoise-shell seam 12.

The leveling layer 4 is formed by pouring concrete and is tightly attached to the upper surface of the lining bottom plate.

The overall construction method of the liner bottom plate of the full-capacity LNG storage tank and the concrete one-time leveling layer comprises the following construction steps:

in a first step, a lining bottom plate is laid in the following order: the edge plate of the outer ring, the edge plate of the inner ring, the transverse middle breadth plate, the longitudinal middle breadth plate and the special-shaped plate.

In a second step, the lining bottom plate is welded according to the following sequence: the weld joints of the edge plate area, the weld joints of the fish scale area, the weld joints of the full-length plate area, the full-length seam and the tortoise-shell seam.

And thirdly, after welding the welding seams of the corner plate and the edge plate area is finished, appearance inspection, vacuum box inspection and nondestructive testing are finished in time. And then, dividing the area of the corner plate and the edge plate into a plurality of subareas, and respectively pouring a concrete primary leveling layer for each subarea.

And fourthly, dividing the scale area into a plurality of cells, assembling and welding the medium webs in each cell in a mode of first two-in-one, then four-in-one and then eight-in-one, and arranging temporary counterweights on two sides of the welding seam during welding. And after welding seams of a certain cell are welded, appearance inspection, vacuum box inspection and nondestructive testing are completed in time, and after the cells are qualified, a concrete primary leveling layer is poured into the cells.

And fifthly, repeating the fourth step until the pouring of the leveling layer of all the cells in the fish scale area is completed.

And sixthly, dividing a joint area formed by the through long plate area and the adjacent tortoise-shell seam area into a plurality of cells, and welding short seams, through long seams and tortoise-shell seams of the through long plate area in each cell. After welding seams of a certain cell are completely welded, appearance inspection, vacuum box inspection and nondestructive testing are completed in time; and after the concrete is qualified, pouring a primary leveling layer of the concrete in the area.

And seventhly, repeating the sixth step until the pouring of the leveling layers of all the cells of the combined area formed by the full length slab area and the tortoise-shell seam area is completed.

And eighthly, finishing the pouring of the concrete primary leveling layer in the ramp area of the large gate hole.

And the concrete primary leveling layer in the corner plate, the edge plate area, the fish scale area, the full-length plate area and the tortoise-shell seam area is completely poured to form a continuous whole, and then the construction is finished.

The corner plate, the edge plate area, the fish scale area, the full length plate area and the tortoise shell seam area are subdivided into a plurality of cells according to specific construction actual conditions, and each cell is constructed according to a planned construction sequence.

And numbering management is carried out during construction of each cell, each cell is independently constructed, procedures are independently handled for handing over after construction is finished, crossed operation of installation specialties and civil engineering specialties is carried out among the cells, and corresponding construction tasks are sequentially carried out in a running mode.

The construction sequence is that the secondary construction door opening is carried out towards the main construction door opening.

During the welding of the through long seam and the tortoise shell seam, the bottom plate is pressed down and tightly attached to the tank bottom by means of the weight of the concrete leveling layer poured in the adjacent area, so that the bottom plate has a counterweight effect on the steel plates on one side or two sides of the welding seam to be welded at the periphery, and the effects of releasing welding stress, controlling concave-convex deformation of the bottom plate and reducing rework of large-area projects are achieved during welding.

The leveling layer is leveled along with pouring, the upper surface of the leveling layer needs to be smooth and flat, and the levelness of the leveling layer meets the requirement.

The levelness of the leveling layer needs to meet the following requirements: the height difference between any two points in the range of 200mm inward and outward of the butt joint edge plate in the whole circumferential length range is not more than 12mm, and the height difference between any two points in the range of 10m is not more than 6 mm.

In the embodiment 1, the area of the bottom plate with concave-convex deformation and the concave-convex deformation are effectively reduced, the requirement on the flatness of the bottom plate is well met, the construction difficulty is reduced, rework caused by the exceeding of the deformation is avoided, the investment of manpower and machine materials is saved, and the engineering quality and the safety performance of the storage tank are improved; and due to the fact that installation and civil engineering professional cross construction are conducted, the construction period of the storage tank is shortened.

Example 2

As shown in fig. 1 to 3, in the liner structure of the full-capacity LNG storage tank according to embodiment 2 of the present invention, the liner is composed of a bottom plate, wall plates 2, and corner plates 3, and the corner plates 3 connect the bottom plate and the wall plates. As shown in fig. 2, the bottom plate, the wall plate 2 and the corner plate 3 are connected and then collectively provided on the concrete base 1. The bottom plate comprises edge plates (annular edge plates, including inner rings and outer rings), a middle web (including transverse webs and longitudinal webs), and a special-shaped plate 9, wherein the edge plates are annular steel plates, the middle web is a rectangular steel plate, and the special-shaped plate 9 is an irregular steel plate.

The edge plate consists of 2 circles, the outer ring edge plate consists of 22 outer ring arc plate single bodies 10 in total, the material is 16MnDR, the thickness is 8mm, the outer diameter is 40490mm, the inner diameter is 38400mm, and butt joint connection is adopted; the inner ring edge plate consists of 22 inner ring arc-shaped plate monomers 11 in total, is made of 16MnDR, has the thickness of 5mm, the outer diameter of 38480mm and the inner diameter of 36355mm, adopts lap joint connection, the lap joint width is 30mm, and the lap joint allowable deviation is +/-5 mm. Outer, two rings of edge boards adopt overlap joint, and the radial width is 4135mm after connecting, and the outside radius is 40490mm after the installation, and the inboard radius is 36355 mm.

The middle web is formed by combining and connecting a transverse middle web (transverse web) and a longitudinal web 8, is made of 16MnDR, and is 5mm thick. The transverse web is lapped by 7 rectangular steel plate short side ends of the transverse web monomers, the rectangular steel plate long side ends are lapped between the longitudinal web and the longitudinal web, the transverse web is lapped with the longitudinal middle web, the lapping width is 30mm, and the lapping allowable deviation is +/-5 mm.

The special-shaped plate 9 is in lap joint, the special-shaped plate 9 and the edge plate of the inner ring are in lap joint, and the special-shaped plate 9 and the middle breadth plate are in lap joint. The special-shaped plate 9 is made of 16MnDR, the thickness is 5mm, the lapping width is 30mm, and the lapping allowable deviation is +/-5 mm.

And after the outer ring edge plate is welded, assembling and welding the corner plate 3, and completing the lap weld between the corner plate 3 and the outer ring edge plate. The corner plate 3 is made of 16MnDR, has the thickness of 5mm and is in lap joint with the outer ring edge plate with the width of 90 mm.

The region formed by connecting the corner plate 3 to the outer ring edge plate and the inner ring edge plate is referred to as an edge plate region.

The area formed by connecting the transverse web plates is called a full-length plate area (namely, a transverse web plate area), and the area formed by connecting the longitudinal web plates is called a fish scale area (namely, a longitudinal web plate area).

The lap weld between the transverse and longitudinal webs is referred to as the through-slit 13.

The lap weld between the profiled sheet and the inner ring edge panel is referred to as the tortoise-shell seam 12.

The leveling layer 4 is formed by pouring concrete, has the thickness of 90mm and is tightly attached to the upper surface of the lining bottom plate.

The liner structure of the full-capacity LNG storage tank in this embodiment 2 adopts the following construction steps:

And thirdly, after welding the welding seams of the corner plate and the edge plate area is finished, appearance inspection, vacuum box inspection and nondestructive testing are finished in time. Thereafter, the region where the corner plate and the edge plate are combined is divided into sections, each numbered A, B, C, D, R. According to the letter sequence, the primary casting of the concrete leveling layer of each subarea A, B, C, D is completed firstly, and the casting of the R area is not performed temporarily.

And fourthly, dividing the scale areas into 5 cells, and managing the numbering of all the scale areas for convenience of construction due to the fact that the scale areas are dispersed, wherein the numbering is carried out on the scale areas, and the scale areas are numbered as (I), (II), (III), (IV) and (V). The welding of the individual fish scale zones follows the following sequence: → ② → ③ → fourthly → fifthly. Firstly, assembling and welding the vertical center-width plate in the first area in a two-in-one mode, then in a four-in-one mode and then in an eight-in-one mode, and arranging temporary balance weights on two sides of a welding seam during welding. And (4) after welding seams of the district are welded, appearance inspection, vacuum box inspection and nondestructive testing are completed in time, and after the result is qualified, a concrete primary leveling layer is poured in the district.

And fifthly, repeating the fourth step until the pouring of the leveling layer in the areas II, III, IV and V is finished.

And sixthly, dividing a joint area formed by the full-length slab area and the adjacent tortoise-shell seam area into 5 cells which are respectively numbered as I, II, III, IV and V. According to the numbering sequence, the welding of the short seam, the long seam and the tortoise-shell seam of the full-length plate area in the area I is firstly completed. After welding, appearance inspection, vacuum box inspection and nondestructive testing are completed in time; and after the concrete is qualified, pouring a primary leveling layer of the concrete in the area.

And seventhly, repeating the sixth step until the pouring of the leveling layer in the areas II, III, IV and V is completed.

And eighthly, finishing the pouring of the concrete primary leveling layer in the ramp region R of the large gate hole.

The above-mentioned all districts are proceeded from the center of the tank to the periphery of the tank and from the secondary construction door opening to the main construction door opening. And each cell is independently constructed, the procedures are independently handled for handover after the construction is finished, the installation specialty and the civil engineering specialty are subjected to cross operation among the cells, and corresponding construction tasks are sequentially carried out in a running mode.

When the through long seam and the tortoise shell seam are welded, the bottom plate is pressed down and tightly attached to the tank bottom by means of the weight of the concrete leveling layer poured in the adjacent area, so that the bottom plate has a counterweight effect on the steel plates on one side or two sides of the peripheral weld joint to be welded, and the effects of releasing welding stress, controlling concave-convex deformation of the bottom plate and reducing rework of large-area projects are achieved during welding.

And after the eighth step, finishing the pouring of the concrete primary leveling layer in the lining bottom plate and the corner plate area, forming a continuous whole, and finishing the construction at the moment.

In conclusion, the liner structure of the full-capacity LNG storage tank and the deformation-preventing construction method thereof provided by the embodiment of the invention have the advantages that the construction difficulty is low, the deformation area and the deformation of the bottom plate can be reduced, the safety performance of the LNG storage tank is improved, the regions of the liner bottom plate are divided according to the construction sequence from the center of the tank to the periphery of the tank and from the secondary construction door opening to the main construction door opening, the construction water flow number is determined for each region, the construction is sequentially carried out according to the water flow number sequence, the welding and the detection of the bottom plate are firstly carried out in each region, then the pouring of the concrete leveling layer is carried out for one time, the rework caused by the exceeding of the deformation is avoided, the investment of manpower and machine materials is saved, the engineering quality is improved, the construction period of the storage tank is greatly shortened through the crossed construction of installation and civil engineering specialties.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Although the present disclosure has been described with reference to the specific embodiments shown in the drawings, it is not intended to limit the scope of the present disclosure, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive faculty based on the technical solutions disclosed in the present disclosure.

Claims

1. A full-capacity LNG storage tank liner structure, comprising:

a bottom plate, a wall plate (2) and a corner plate (3);

the bottom plate, the wall plate (2) and the corner plate (3) are arranged on the concrete substrate (1) together, and the upper surface of the bottom plate is provided with a leveling layer (4);

the bottom plate and the wall plate (2) are connected through the corner plate (3), the vertical side (5) of the corner plate (3) is connected with the wall plate (2), and the horizontal side (6) of the corner plate (3) is connected with the bottom plate;

the bottom plate comprises an annular edge plate, and a plurality of transverse breadth plates are arranged on the inner ring of the annular edge plate along the direction of the construction door opening; the space between two adjacent transverse amplitude plates is equal, a plurality of longitudinal amplitude plates (8) are connected between the two adjacent transverse amplitude plates and between the transverse amplitude plates at two ends and the annular edge plate, and the adjacent longitudinal amplitude plates (8) are connected with each other; a plurality of special-shaped plates (9) are connected between the longitudinal web (8) at the outermost side and the annular edge plate, and two adjacent special-shaped plates (9) are connected with each other.

2. The full-capacity LNG storage tank liner structure of claim 1, wherein:

the annular edge plate comprises an outer ring edge plate and an inner ring edge plate;

the outer ring edge plate is formed by connecting a plurality of outer ring arc-shaped plate single bodies (10) with each other;

the inner ring edge plate is formed by mutually connecting a plurality of inner ring arc-shaped plate monomers (11);

the transverse web is formed by a plurality of transverse web elements (7) interconnected.

3. The full-capacity LNG storage tank liner structure of claim 2, wherein:

the two ends of the outer ring arc-shaped plate monomers (10) are sequentially butted to form the outer ring edge plate, and the two ends of the inner ring arc-shaped plate monomers (11) are sequentially lapped to form the inner ring edge plate.

4. The full-capacity LNG storage tank liner structure of claim 3, wherein:

the adjacent transverse web single bodies (7) are in lap joint in sequence, the adjacent longitudinal webs (8) are in lap joint, and the transverse webs and the longitudinal webs (8) are in lap joint.

5. The full-capacity LNG storage tank liner structure of claim 4, wherein:

the corner plate (3) is connected with the annular edge plate to form an edge plate area; a plurality of transverse web single bodies (7) are connected to form a through long web area, and a plurality of longitudinal webs (8) are connected to form a fish scale area; the lap weld between the transverse web and the longitudinal web (8) is a through-length seam (11); the lap weld between the special-shaped plate (9) and the edge plate of the inner ring is a tortoise-shell seam (10).

6. The full-capacity LNG storage tank liner structure according to any one of claims 1 to 5, wherein: the transverse webs, the longitudinal webs (8), the profiled sheets (9), the annular edge plates and the corner plates (3) are all made of 16MnDR material.

7. A deformation-preventing construction method of a liner structure of a full-capacity LNG storage tank according to any one of claims 1 to 6, wherein construction is performed in a direction from a sub-construction door opening to a main construction door opening; the method comprises the following steps:

8. The deformation-preventing construction method of the liner structure of the full-capacity LNG storage tank according to claim 7, characterized in that: and the concrete primary leveling layer in the edge plate area, the fish scale area, the full-length plate area and the tortoise-shell seam area is completely poured, and after a continuous whole is formed, the construction is finished.

9. The deformation-preventing construction method of the liner structure of the full-capacity LNG storage tank according to claim 8, characterized in that: when the through long seam and the tortoise shell seam are welded, the bottom plate is pressed down and tightly attached to the tank bottom by means of the weight of the concrete leveling layer poured in the adjacent area, so that the bottom plate has a counterweight effect on one side or two sides of the welding seam to be welded on the periphery.

10. The deformation-preventing construction method of the liner structure of the full-capacity LNG storage tank according to claim 9, characterized in that: the levelness of the leveling layer needs to meet the following requirements: the height difference between any two points in the range of 200mm inward and outward of the butt joint edge plate in the whole circumferential length range is not more than 12mm, and the height difference between any two points in the range of 10m is not more than 6 mm.